Wood-screw-machine tool feed



Feb. 6, 1923. 1,444,432.

H.. L. SMITH.

WOOD SCREW MACHINE TOOL FEED.

FILED JAN.3, 1922.

26 I 4 20 I if I V 7 JMI' ATTdA /VEL! Patented Felt)o 53 lg a UNHTEI) nann L. stirrer, or wn'rnnsnny,

nncrronr.

application filed January 3, 1922.

To all 207mm it may concern.

Be it known that l, HENRY L. SMITH, a citizenlof the United States, residing at Wa- .te'rbury, in the county of New Haven and State of Connecticut, have invented a new and usefullmprovement in Wood-Screw- Machine Tool Feed, of which the following is a specification- This invention relates to those machines to which are designed .to cut a plurality of threads on screw blanks. In automatic wood screw machines the thread cutting tools are fed and returned along each blank several times; At the end'of each feed the to cutting edges of the tools are turned out from the blank so thatthey may be returned for the next'cut; After each retnrn the cutting edges are turned in toward the axis of the'blanlr, slightly further than dur- 20 ing the previous forward feed so as to in-.

crease the depth ,of the cuts. The feed and return. movements are controlled by feed cams; the depthsof the cuts are controlled by depthcams and the contours of the cuts 25 are controlled by profile came.

The object of the present invention is to so design the tool controlling mechanism of a screw machine of this class which has two threading tools on the same side of the to blank, that while bothtools are fed by the same feed camthe threads cut will start on diametricallyopposite sides of the blank at the same distance from the point.

: To accomplish this with two'tools ar- 35 ranged side by side on the same side of the blank and fed and returned together by the:

same means, in the embodiment of the in vention illustrated two similar profile cams,. one for each tool, and two similar depth to cams, one for each profile cam, are arranged to co-operate in such manner that the following tool is not turned into cutting position until it has been fed longitudinally of the blank such a distance that it will begin 4.5 to cut on the opposite side of the blank at the same distance from thepoint that the advance tool started cutting.

In the accompanying drawings Figure 1 shows a front elevation of so much of a to wood screw machine as is necessary to an understanding of the present invention. Fig. 2 shows a vertical section of the mech anism taken on the plane indicated by the dotted line 22 on Fig. 3. Fig. 3 shows CONNECTICUT, ASfiIGNUR TO THE E; 3 MAGEEITE COMPANY, OF 'WATERBURY,

spring holds the .agalnstthe feed cam.

'in engagement with the edge of the cam/1G by a spring 17. Fastened to the bythe common feed the and MAH'WLLLE CONNECTICUT, A CGREGRQTTQN GWE- VJQOD-SCBEWE-EEEGHZNE TOOL FEED.

Serial No. 526,495.

a plan of the depth cams and profile cams withtheir co-operating connections which control the actions of the two tools.

In the machine illustrated the following tool t is clamped ina holder 5 that is fastened to a tubular shaft 6. The advance tool 7 is clamped in a holder 8 that is fastened to a tubular shaft 9 which is fitted upon the shaft 6 so that the two shafts may be rotated independently but will move longltudlnally as one.-' One end of the shaft 6 has a shoe 10' that is heldin engagement with the feed cam 11 of common outline and-which is rotated by the usual niechamsm. In the interior of the shaft 6 is a sp ral spring 12 which is arranged to thrust between the shaft at a point near the feed cam and a rod 13 that extends into the other end of the shaft. The pressure of this shaft shoe yieldingly Fastened to the shaft 6 which carries the following tool is a rocker arm let that at its forward end hasa shoe 15 which is held p o le shaft 9 which carries the advance tool is a rocker. arm 18 that at its forward end has a shoe 19 wh'ich is held in engagement with the edge of a profile cam 20by a spring 21. Through these parts the tools are turned in toward and out from the screw blank independe ntly,'each controlled by its own profile cam, as the shaftis fed aiid returned spring. The profile cams which aresimilar are adjustablyfastened to the fronts fisimilar yokeshaped saddles 22 pivotally mounted in the frame 23 concen tric With'the shafts fl and Projecting rearwardly from the saddles are levers 24 the ends of which are successively engaged by the surfaces 25 of the cut cams 26 that are adjustably mounted on the cam shaft 27. The 'cut' cams illustrated are alike and are of the type described in United States Letters Patent #1,196,308 granted on my application August 2961,1916. When the end of one of these levers is engaged by one of the cam surfaces the saddle to which the lever is attached is swungso as. to rockthe feed shaft which is controlled by the profile cam carried by that saddle and turn the tool that is mountedon that shaft in t0- wh'ich are independently.

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' its cut ithtil it is the same ward the screw blank. The parts are so timed that he ends of the levers drop into one of the spaces 28 and "allow the tools to be drawn away from the screw blank as the return. movement of the tools is being efiected. aeh succeeding projection of the cams is higher than the preceding projections in order that a deeper cut shall he made by the tools after each return movement, as set forth in the abate mentioned atent. The cut cam which through its profile cant controls the following tool is adjnsthd fightly behind the cut cam w through it's profile cam controls the advance tool so that the following tool will not be engaged with the blank for cutting until it has reached the locality opposite the point where the advance tool was turned up and began to eat. The cam shaft and feed cam illustrated may be driven by mechanism similar? to that described in United States llretters Patent #1,170,694 granted on my a lication February 8th, 1916. I

y the means described while one tool follows the other and both are fed by the same feed cam, the tollowing tool does not begin I distance from the point and diametrically opposite from where the advance tool began to cut the blank "and at a result twe threads each of which starts the same distance from the point.

"Jlhe invention claimed is:

11 A screw machine havin a plurality of threading tools arranged siide by side and mounted to move together longitudinally of the blank to be threaded, but move independently transversely of the blank, common means tor feeding the tools together longitudinali at the blank, and independent means or feeding the tools transversely of the blank, said latter means acting to feed the advance tool transversely before feeding the followingtool transversely, whereby the tools begin to cut at the same distance from the point of the rate thread.

2; A screw machine having a plurality of threading teol's arranged side by side on the same side of the blank to be threaded, said hich threadin tools arranged side a screw is formed with the position blank but each cuts a sep atools being mounted to move together longitndin'ally of the blank, b'iitgnove independently transversely of the lank, and independent means for oscillating the advance tvol transversely of the blank before oscillating the following tool transversely of the blank, whereby the tools begin to cut at the same distance from the point of the blank.

3. A screw machine having a plurality of threadihg tool's arranged sid by side on the same'side of the blank to be threaded, a common cam for feeding both tools independent cams for determining the de pth of cuts of the tools, and independent cams for determining the profile of he cuts, said profile cam's being inde endently oscillated the depth cut cams gr oscillating the tools. a. A screw machine ham Si IV. same si e of the blank to be threaded, a common feed cam for feeding both tools longitudinally of the blank, a common spring for returning both tools together, independent cut cams for detern'rniing the depth of the cut of the tools", and independent profile cams cam for moving the tools toward and from the blank. I

5'. A screw machine having a plurality of threading tools arran ed side by side oh the same side of the blan to be threaded, a cam for feeding'the tobls lon 'tndinally oi the blank, cams for swinging the tools toward the axis of the blank, and cams controlling or the latter cams, said Cam's being so timed v not begin to out until it has reached the locality with relation to the point of the blanl; at which the advance tonl began to cut.

6. A screw machine havingv a plurality of threading tools arrangedjside by side on the same side of the blank to be threaded, a single cam for feeding the tools longitudinally of the blank, and two indep'endeht profile cams and two independent cut cams for oscillating the tools independently toward and from the blank, said cams beiiig adjusted to cause the advance tool to begin cutting before the iollowin tool is allbwed to out.

iENRY L. Sl /lll'lll.

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each controlled by a cutthat the following tool does 

